Drone, missile or other? Two commercial flights have been buzzed by similar UFOs north of Perth. Photo: AP

The De Havilland DHC-8 aircraft was about 25 kilometres north-east of Perth at an altitude of around 4000 feet when the object passed within 20 metres of the flight, according to an incident report lodged with the Australian Transport Safety Authority.

The pilot's testimony in the report described the object as "cylindrical in shape and grey in colour"

Drone, missile or other? Two commercial flights have been buzzed by similar UFOs north of Perth.

UFO researcher Paul Dean told 6PR that while this object is definitely terrestrial in origin it begs further investigation. Especially given it was the second time a Skippers flight had reported an incident like this.

Speaking with Chris Ilsley, Mr Dean said another Skippers' flight reported an identical incident in nearly the same location at approximately the same time on January 4, 2013.

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Mr Dean said military sources have ruled out the possibility of a drone or a missile test from known military sites like Pearce Air Base. An assertion that is backed by the ATSA's report from the 2014 incident